JP2856241B2 - Gradation control method for plasma display device - Google Patents

Gradation control method for plasma display device

Info

Publication number
JP2856241B2
JP2856241B2 JP5288345A JP28834593A JP2856241B2 JP 2856241 B2 JP2856241 B2 JP 2856241B2 JP 5288345 A JP5288345 A JP 5288345A JP 28834593 A JP28834593 A JP 28834593A JP 2856241 B2 JP2856241 B2 JP 2856241B2
Authority
JP
Japan
Prior art keywords
display device
plasma display
sub
luminance
light emission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP5288345A
Other languages
Japanese (ja)
Other versions
JPH07140928A (en
Inventor
慶真 長岡
正也 田島
好正 粟田
義一 金澤
壽男 上田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=17729008&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JP2856241(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5288345A priority Critical patent/JP2856241B2/en
Priority to DE69424122T priority patent/DE69424122T2/en
Priority to EP94300695A priority patent/EP0653740B1/en
Priority to DE69431681T priority patent/DE69431681T2/en
Priority to EP98203252A priority patent/EP0887785B1/en
Priority to KR1019940001769A priority patent/KR970000911B1/en
Publication of JPH07140928A publication Critical patent/JPH07140928A/en
Priority to US08/488,201 priority patent/US5943032A/en
Publication of JP2856241B2 publication Critical patent/JP2856241B2/en
Application granted granted Critical
Priority to US09/938,303 priority patent/USRE40769E1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
    • G09G3/2932—Addressed by writing selected cells that are in an OFF state
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
    • G09G3/2935—Addressed by erasing selected cells that are in an ON state
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
    • G09G3/2946—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge by introducing variations of the frequency of sustain pulses within a frame or non-proportional variations of the number of sustain pulses in each subfield
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/298—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels using surface discharge panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0228—Increasing the driving margin in plasma displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/292—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
    • G09G3/2927—Details of initialising

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明はプラズマディスプレイ装
置の階調制御方法に関する。近年、フラットディスプレ
イにおける大画面化, 大容量化, フルカラー表示化の要
求に伴って、交流型プラズマ・ディスプレイ・パネル
（ＡＣ型ＰＤＰ:Plasma Display Panel)においても多く
の表示ラインでの多階調表示が必要となって来ている。
そして、ＡＣ型ＰＤＰとして、所望の輝度による多階調
表示が可能なプラズマディスプレイ装置の階調制御方法
が要望されている。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gradation control method for a plasma display device. In recent years, with the demand for larger screens, larger capacities, and full-color displays in flat displays, AC-type plasma display panels (AC-type PDPs: Plasma Display Panels) have multi-gradation display on many display lines. Is becoming necessary.
As an AC type PDP, there is a demand for a gradation control method of a plasma display device capable of performing multi-gradation display with desired luminance.

【０００２】[0002]

【従来の技術】従来、ＡＣ型ＰＤＰとしては、２本の維
持電極に、交互に電圧波形を印加することで放電を持続
し、発光表示を行うものが知られている。このＡＣ型Ｐ
ＤＰにおいて、一度の放電は、パルス印加直後、１μｓ
から数μｓで終了する。さらに、放電によって発生した
正電荷であるイオンは、負の電圧が印加されている電極
上の絶縁層の表面に蓄積され、同様に、負電荷である電
子は、正の電圧が印加されている電極上の絶縁層の表面
に蓄積される。2. Description of the Related Art Heretofore, there has been known an AC-type PDP which sustains a discharge by alternately applying a voltage waveform to two sustain electrodes to perform light emission display. This AC type P
In DP, one discharge is performed for 1 μs immediately after pulse application.
And ends in a few μs. Further, ions that are positive charges generated by the discharge are accumulated on the surface of the insulating layer on the electrode to which a negative voltage is applied, and similarly, electrons that are negative charges are applied with a positive voltage. It is accumulated on the surface of the insulating layer on the electrode.

【０００３】従って、初めに高い電圧（書き込み電圧）
のパルス（書き込みパルス）で放電させ壁電荷を生成し
た後、極性の異なる前回よりも低い電圧（維持電圧また
は維持放電電圧）のパルス（維持パルスまたは維持放電
パルス）を印加すると、前に蓄積された壁電荷が重複さ
れ、放電空間に対する電圧は大きなものとなり、放電電
圧のしきい値を越えて放電を開始する。つまり、一度書
き込み放電を行い壁電荷を生成したセルは、その後、維
持パルスを交互に逆極性で印加することで、放電を持続
するという特徴がある。これをメモリ効果、またはメモ
リ機能と呼んでいる。一般に、ＡＣ型ＰＤＰは、このメ
モリ効果を利用して表示を行うものである。Therefore, a high voltage (write voltage) is initially required.
When a pulse (sustain pulse or sustain discharge pulse) of a different polarity (sustain voltage or sustain discharge voltage) with a lower polarity than the previous one (sustain pulse or sustain pulse) is applied after the discharge with the pulse (write pulse) The accumulated wall charges are overlapped, the voltage to the discharge space becomes large, and the discharge exceeds the threshold value of the discharge voltage to start the discharge. In other words, the cell which has once performed the write discharge to generate the wall charge is characterized in that the sustain pulse is alternately applied with the opposite polarity to continue the discharge. This is called a memory effect or a memory function. In general, an AC type PDP performs display using this memory effect.

【０００４】近年、ＡＣ型ＰＤＰとしては、２本の電極
で選択放電（アドレス放電）および維持放電を行う２電
極型、および、第３の電極を利用してアドレス放電を行
う３電極型が提案されている。また、階調表示を行うカ
ラーＰＤＰでは、放電により発生する紫外線によって放
電セル内に形成した蛍光体を励起しているが、この蛍光
体は、放電により同時に発生する正電荷であるイオンの
衝撃に弱いという欠点がある。In recent years, a two-electrode type that performs selective discharge (address discharge) and sustain discharge using two electrodes and a three-electrode type that performs address discharge using a third electrode have been proposed as AC-type PDPs. Have been. Further, in a color PDP for performing gradation display, a phosphor formed in a discharge cell is excited by ultraviolet rays generated by discharge. However, this phosphor is affected by the impact of positive ions generated simultaneously by discharge. It has the disadvantage of being weak.

【０００５】上記の２電極型では、蛍光体がイオンに直
接当たるような構成になっているため、蛍光体の寿命低
下を招く恐れがある。これを回避するために、カラーＰ
ＤＰでは、面放電を利用した３電極構造が一般に用いら
れている。さらに、この３電極型においても、第３の電
極を維持放電を行う第１と第２の電極が配置されている
基板に形成する場合と、対向するもう一つの基板に配置
する場合がある。また、同一基板に前記の３種の電極を
形成する場合でも、維持放電を行う２本の電極の上に第
３の電極を配置する場合と、その下に第３の電極を配置
する場合がある。さらに、蛍光体から発せられた可視光
を、その蛍光体を透過してみる場合と、蛍光体からの反
射をみる場合がある。本明細書では、維持放電を行う電
極の基板とは別な対向する基板に第３の電極を形成する
パネルを例に採って説明する。[0005] In the above two-electrode type, since the phosphor is directly hit by the ions, the life of the phosphor may be shortened. To avoid this, the color P
In DP, a three-electrode structure using surface discharge is generally used. Further, also in this three-electrode type, the third electrode may be formed on a substrate on which first and second electrodes for performing sustain discharge are arranged, or may be arranged on another opposing substrate. Further, even when the above-mentioned three types of electrodes are formed on the same substrate, there are cases where a third electrode is arranged on two electrodes for performing sustain discharge, and cases where a third electrode is arranged thereunder. is there. Further, there are cases where visible light emitted from a phosphor is transmitted through the phosphor, and cases where reflection from the phosphor is observed. In this specification, a panel in which a third electrode is formed on a substrate opposite to the substrate on which sustain discharge is performed will be described as an example.

【０００６】図６は従来の３電極面放電交流駆動型のプ
ラズマディスプレイパネルの概略的構造を示す平面図で
あり、図７は図６のプラズマディスプレイパネルにおけ
る１つの放電セルの概略的構造を示す断面図である。こ
こで、図６は、Ｍ×Ｎドットのパネル構造（電極構造）
を示している。図６および７において、参照符号１は前
面ガラス基板, ２は背面ガラス基板,３はアドレス電極,
４は壁, ５は壁の間に設けられた蛍光体, ６は誘電体
層, ７および８はＸ電極およびＹ電極を示している。こ
のＡＣ型ＰＤＰにおいて、放電は主に背面ガラス基板２
上に配置された２本の維持放電電極（Ｘ電極７およびＹ
電極８）の間で行われ、また、表示データに応じた画素
（放電セル）の選択は、Ｙ電極８とアドレス電極３との
間の放電を利用して、該当するＹ電極８を含むライン上
のセルを選択して行うようになっている。各維持放電電
極(7,8) 上には、絶縁のための誘電体層６が形成され、
該誘電体層６上に保護膜であるＭｇＯ膜が形成されてい
る。さらに、背面ガラス基板２と向かい合う前面ガラス
基板１には、アドレス電極３および蛍光体５が形成され
ている。ここで、蛍光体５は、カラー表示を可能とする
ために、赤・緑・青の発光特性を有し、該蛍光体５はア
ドレス電極３上に形成されている。FIG. 6 is a plan view showing a schematic structure of a conventional three-electrode surface discharge AC drive type plasma display panel, and FIG. 7 shows a schematic structure of one discharge cell in the plasma display panel of FIG. It is sectional drawing. Here, FIG. 6 shows an M × N dot panel structure (electrode structure).
Is shown. 6 and 7, reference numeral 1 denotes a front glass substrate, 2 denotes a rear glass substrate, 3 denotes an address electrode,
Reference numeral 4 denotes a wall, 5 denotes a phosphor provided between the walls, 6 denotes a dielectric layer, and 7 and 8 denote X electrodes and Y electrodes. In this AC type PDP, discharge mainly occurs on the rear glass substrate 2.
The two sustain discharge electrodes (X electrodes 7 and Y
Selection of a pixel (discharge cell) according to display data is performed between the electrodes 8) by using a discharge between the Y electrode 8 and the address electrode 3 to select a line including the corresponding Y electrode 8. This is done by selecting the upper cell. A dielectric layer 6 for insulation is formed on each of the sustain discharge electrodes (7, 8).
On the dielectric layer 6, an MgO film serving as a protective film is formed. Further, address electrodes 3 and phosphors 5 are formed on the front glass substrate 1 facing the rear glass substrate 2. Here, the phosphor 5 has red, green, and blue emission characteristics to enable color display, and the phosphor 5 is formed on the address electrode 3.

【０００７】放電空間は、ガラス基板の片側もしくは両
側に形成された壁（障壁）４によって分離され、放電は
その中で各セル毎に起こるようになっており、放電によ
って発生した紫外線が蛍光体を発光させて表示を行うよ
うになっている。このような構成を有するセルを、例え
ば、マトリクス状に（Ｍ×Ｎ）個だけ配列することによ
り、図６に示すようなディスプレイパネルが構成され
る。ここで、図６において、参照符号Ａ1 〜ＡM はアド
レス電極３を示し、Ｙ1 〜ＹN はＹ電極８を示してい
る。また、各セルに対するＸ電極７は、共通結線とされ
ている。[0007] The discharge space is separated by walls (barriers) 4 formed on one or both sides of the glass substrate, and the discharge occurs in each cell in the discharge space. Are displayed, and display is performed. By arranging, for example, only (M × N) cells having such a configuration in a matrix, a display panel as shown in FIG. 6 is formed. Here, in FIG. 6, reference numerals A 1 to A M indicate address electrodes 3, and Y 1 to Y N indicate Y electrodes 8. The X electrode 7 for each cell is connected in common.

【０００８】図８は図６に示すプラズマディスプレイパ
ネルを用いた３電極面放電交流駆動型プラズマディスプ
レイ装置の一例を示すブロック図であり、代表的な３電
極・ＡＣ型ＰＤＰを駆動するための周辺回路を示すもの
である。図８において、参照符号１０は制御回路、１１
は表示データ制御部、１２はフレームメモリ、１３はパ
ネル駆動制御部、１４はスキャンドライバ制御部、そし
て、１５は共通ドライバ制御部である。さらに、参照符
号２１はアドレスドライバ、２２はＸドライバ、２３は
Ｙスキャンドライバ、２４はＹドライバ、そして、３０
はプラズマ・ディスプレイ・パネル（ＰＤＰ）である。FIG. 8 is a block diagram showing an example of a three-electrode surface-discharge AC drive type plasma display device using the plasma display panel shown in FIG. 6, showing a peripheral portion for driving a typical three-electrode AC type PDP. 2 shows a circuit. 8, reference numeral 10 denotes a control circuit, and 11 denotes a control circuit.
Denotes a display data control unit, 12 denotes a frame memory, 13 denotes a panel drive control unit, 14 denotes a scan driver control unit, and 15 denotes a common driver control unit. Further, reference numeral 21 is an address driver, 22 is an X driver, 23 is a Y scan driver, 24 is a Y driver, and 30
Is a plasma display panel (PDP).

【０００９】また、図８において、参照符号ＣＬＯＣＫ
は表示データを示すドットクロック、ＤＡＴＡは表示デ
ータ（２５６階調カラー表示の場合は、各色８ビット：
３×８）、ＶＳＹＮＣは垂直同期信号、１フレーム（１
フィールド）の開始を示す信号、そして、ＨＳＹＮＣは
水平同期信号を示している。制御回路１０は、表示デー
タ制御部１１およびパネル駆動制御部１３を備えてい
る。表示データ制御部１１は、表示データをフレームメ
モリ１２に蓄え、パネルの駆動タイミングに合わせて、
アドレスドライバ２１に転送するものである。ここで、
参照符号Ａ−ＤＡＴＡは表示データ、また、Ａ−ＣＬＯ
ＣＫは転送クロックを示している。In FIG. 8, reference numeral CLOCK is used.
Is a dot clock indicating display data, and DATA is display data (in the case of 256 gradation color display, 8 bits for each color:
3 × 8), VSYNC is a vertical synchronization signal, one frame (1
HSYNC indicates a horizontal synchronizing signal. The control circuit 10 includes a display data control unit 11 and a panel drive control unit 13. The display data control unit 11 stores the display data in the frame memory 12, and adjusts the display data in accordance with the driving timing of the panel.
This is transferred to the address driver 21. here,
Reference symbol A-DATA is display data, and A-CLO
CK indicates a transfer clock.

【００１０】パネル駆動制御部１３はパネル３０に高圧
波形を印加するタイミングを決定するものであり、スキ
ャンドライバ制御部１４および共通ドライバ制御部１５
を備えている。ここで、参照符号Ｙ−ＤＡＴＡはスキャ
ンデータ（Ｙスキャンドライバを１ビット毎にＯＮさせ
るためのデータ）、Ｙ−ＣＬＯＣＫは転送クロック（Ｙ
スキャンドライバを１ビット毎にＯＮさせるためのクロ
ック）、Ｙ−ＳＴＢ１はＹストローブ１（Ｙスキャンド
ライバをＯＮさせるタイミング規定する信号）、そし
て、Ｙ−ＳＴＢ２はＹストローブ２を示している。ま
た、参照符号Ｘ−ＵＤはＸ側共通ドライバのＯＮ／ＯＦ
Ｆを制御する信号（Ｖｓ／Ｖｗを出力）、Ｘ−ＤＤはＸ
側共通ドライバのＯＮ／ＯＦＦを制御（ＧＮＤ）、Ｙ−
ＵＤはＹ側共通ドライバのＯＮ／ＯＦＦを制御（Ｖｓ／
Ｖｗを出力）、そして、Ｙ−ＤＤはＸ側共通ドライバの
ＯＮ／ＯＦＦを制御（ＧＮＤ）を示している。The panel drive control section 13 determines the timing of applying a high voltage waveform to the panel 30. The scan drive control section 14 and the common driver control section 15
It has. Here, reference numeral Y-DATA is scan data (data for turning on the Y scan driver for each bit), and Y-CLOCK is a transfer clock (Y
A clock for turning on the scan driver for each bit), Y-STB1 indicates Y strobe 1 (a signal for defining the timing for turning on the Y scan driver), and Y-STB2 indicates Y strobe 2. Reference symbol X-UD indicates ON / OF of the X-side common driver.
F-control signal (output Vs / Vw), X-DD is X
ON / OFF control of common driver (GND), Y-
UD controls ON / OFF of Y side common driver (Vs /
Vw is output), and Y-DD indicates ON / OFF control of the X-side common driver (GND).

【００１１】図８に示されるように、アドレス電極３は
１本毎にアドレスドライバ２１に接続され、該アドレス
ドライバ２１によってアドレス放電時のアドレスパルス
が印加される。また、Ｙ電極８は個別にＹスキャンドラ
イバ２３に接続される。スキャンドライバ２３はＹ側共
通ドライバ（Ｙドライバ）２４に接続されており、アド
レス放電時のパルスはＹスキャンドライバ２３から発生
する。また、維持パルス等はＹドライバ２４で発生し、
Ｙスキャンドライバ２３を経由して、Ｙ電極８に印加さ
れる。さらに、Ｘ電極７は、パネル３０の全表示ライン
に渡って共通に接続される。そして、Ｘ側共通ドライバ
（Ｘドライバ）２２は、書き込みパルスおよび維持パル
ス等を発生する。これらのドライバ回路は、制御回路１
０によって制御され、該制御回路１０は、装置の外部よ
り入力される同期信号や表示データ信号によって制御さ
れる。As shown in FIG. 8, the address electrodes 3 are connected one by one to an address driver 21, and the address driver 21 applies an address pulse at the time of address discharge. The Y electrodes 8 are individually connected to a Y scan driver 23. The scan driver 23 is connected to a Y-side common driver (Y driver) 24, and a pulse at the time of address discharge is generated from the Y scan driver 23. Also, the sustain pulse and the like are generated by the Y driver 24,
The voltage is applied to the Y electrode 8 via the Y scan driver 23. Further, the X electrodes 7 are commonly connected to all display lines of the panel 30. Then, the X-side common driver (X driver) 22 generates a write pulse, a sustain pulse, and the like. These driver circuits include a control circuit 1
The control circuit 10 is controlled by a synchronization signal or a display data signal input from outside the device.

【００１２】図９は図８のプラズマディスプレイ装置に
おける駆動波形の一例を示す図であり、いわゆる『アド
レス／維持放電分離型・書き込みアドレス方式』におけ
る１サブフレーム（または、１サブフィールド）の駆動
波形を示すものである。この方法は、特願平３−３３８
３４２号に示した方法であり、この例は、フルカラーの
ための多階調表示を行う場合に適用され、且つ、低電圧
で安定な駆動（アドレス）を行うことを目的とした駆動
方法である。FIG. 9 is a diagram showing an example of a driving waveform in the plasma display device of FIG. 8, and shows a driving waveform of one sub-frame (or one sub-field) in a so-called "address / sustain discharge separated type / write address system". It shows. This method is disclosed in Japanese Patent Application No. 3-338.
No. 342, and this example is a driving method which is applied when performing multi-gradation display for full color and aims at performing stable driving (address) at low voltage. .

【００１３】図９に示されるように、１サブフレーム内
は、アドレス期間および維持放電期間に分離される。そ
して、アドレス期間においては、全面書き込み，全面消
去，および，線順次書き込み（アドレス）が行われ、ま
た、維持放電期間においては、全ライン同時に維持パル
スが印加され、書き込みアドレスが実行され壁電荷が蓄
積されたセルに対して維持放電が行われる。ここで、１
サブフレームは、例えば、インターレース（飛び越し操
作）処理により１フレームの画面を２つのサブフレーム
により構成する場合には、各サブフレームにおけるサブ
フィールドに対応する。As shown in FIG. 9, one subframe is divided into an address period and a sustain discharge period. In the address period, full-surface writing, full-surface erasure, and line-sequential writing (address) are performed. In the sustain discharge period, a sustain pulse is applied simultaneously to all lines, the write address is executed, and the wall charge is reduced. Sustain discharge is performed on the stored cells. Where 1
The sub-frame corresponds to a sub-field in each sub-frame, for example, when a screen of one frame is composed of two sub-frames by an interlace (jump operation) process.

【００１４】この図９に示す駆動方法の特長は、アドレ
ス期間の始めに行われる全面書き込みと全面消去によっ
て、全セルの状態を均一とし、さらに、次に行われる線
順次書き込み放電（アドレス放電）に有効な壁電荷を残
した状態で消去の完了とすることである。まず、Ｙ電極
がＧＮＤレベルになり、同時にＸ電極に電圧Ｖｗからな
る書き込みパルスが印加されて全面書き込みが行われ
る。この時、アドレス電極側、実際には蛍光体等の絶縁
物表面に、正電荷であるイオンが蓄積される。そして、
次のステップで、電圧Ｖｅからなる消去パルスが印加さ
れることにより、全面消去が行われる。消去放電は、Ｘ
電極とＹ電極の絶縁層（ＭｇＯ膜）表面に壁電荷が無い
状態を作り出すものであるが、好ましくは、Ｙ電極側の
ＭｇＯ面には、次のアドレス放電に有利な負電荷である
電子を蓄積し、且つ、その際、残留した壁電荷の電圧値
は、Ｘ電極およびＹ電極に維持放電パルスが印加されて
も、維持放電を起こさないレベルでなくてはならない。The driving method shown in FIG. 9 is characterized in that the state of all the cells is made uniform by the entire writing and erasing performed at the beginning of the address period, and further, the line sequential writing discharge (address discharge) performed next. To complete the erasure with the effective wall charges remaining. First, the Y electrode goes to the GND level, and at the same time, a write pulse consisting of the voltage Vw is applied to the X electrode, and the entire surface is written. At this time, positively charged ions are accumulated on the address electrode side, actually on the surface of an insulator such as a phosphor. And
In the next step, the entire surface is erased by applying an erase pulse consisting of the voltage Ve. The erase discharge is X
This is to create a state where there is no wall charge on the surface of the insulating layer (MgO film) between the electrode and the Y electrode. Preferably, an electron which is a negative charge advantageous for the next address discharge is applied to the MgO surface on the Y electrode side. The voltage value of the accumulated and remaining wall charges at that time must be at a level that does not cause a sustain discharge even when a sustain discharge pulse is applied to the X electrode and the Y electrode.

【００１５】これらの、均一化とアドレスの低電圧化を
狙った、全面書き込み全面消去を経た後に、線順次に書
き込み放電（アドレス放電）が行われる。この放電は、
書き込みを行うラインのＹ電極をＧＮＤレベルとして、
そのライン中の書き込みを行うセルのアドレス電極に、
電圧Ｖａからなるアドレスパルスが印加されて行われ
る。この際、アドレス側（蛍光体表面）にはイオンが、
Ｙ電極側（ＭｇＯ面）には電子がそれぞれ蓄積されたい
るため、非常に低い電圧でアドレス放電が可能となる。
これらの動作が、全ラインに渡り実行された後、Ｘ電極
とＹ電極に交互に維持パルスが印加され維持放電が行わ
れる。After the entire writing and erasing operations are performed for the purpose of uniforming and lowering the address voltage, a writing discharge (address discharge) is performed in a line-sequential manner. This discharge
When the Y electrode of the line for writing is set to the GND level,
To the address electrode of the cell in the line where writing is performed,
The operation is performed by applying an address pulse composed of a voltage Va. At this time, ions are present on the address side (the phosphor surface).
Since electrons are desired to be accumulated on the Y electrode side (MgO surface), address discharge can be performed at a very low voltage.
After these operations are performed over all the lines, sustain pulses are alternately applied to the X electrodes and the Y electrodes to perform sustain discharge.

【００１６】図１０は図８のプラズマディスプレイ装置
において駆動されるセルの様子を模式的に示す図であ
り、同図(a) 〜(d) は１つの放電セル内の電荷の配置お
よび放電の状態に着目してモデル化した図を示してい
る。すなわち、同図(a) は全セル（全面）書き込み段階
（アドレス電極側に正電荷（イオン）を蓄積する。）、
同図(b) は全セル維持放電段階、同図(c) は全セル消去
段階（維持放電電極側の壁電荷を維持放電電圧（Ｖｓ）
を印加しても放電が起きない値まで減少させる。ここ
で、Ｙ電極側に負の壁電荷（電子）を残す事が出来れ
ば、次のアドレス放電に有効に作用する。）、そして、
同図(d) は選択書き込み段階（アドレス放電：アドレス
電極側の壁電荷を利用して書き込み放電を行う。）を示
している。FIGS. 10A to 10D are diagrams schematically showing the states of the cells driven in the plasma display device of FIG. 8, and FIGS. 10A to 10D show the arrangement of the charges in one discharge cell and the discharge. The figure which modeled focusing on a state is shown. That is, FIG. 3A shows a writing stage for all cells (entire surface) (positive charges (ions) are accumulated on the address electrode side).
FIG. 4B shows an all-cell sustaining discharge stage, and FIG. 5C shows an all-cell erasing stage (sustain discharge voltage (Vs) of wall charges on the sustain discharge electrode side).
Is reduced to a value at which discharge does not occur even when voltage is applied. Here, if a negative wall charge (electrons) can be left on the Y electrode side, it effectively acts on the next address discharge. ), And
FIG. 9D shows a selective writing stage (address discharge: write discharge is performed using wall charges on the address electrode side).

【００１７】まず、図１０(a) に示されるように、全セ
ル書き込み段階では、アドレス電極３側にイオン、Ｘ電
極７およびＹ電極８側にそれぞれイオンおよび電子が壁
電荷として蓄積される。次に、図１０(b) に示されるよ
うに、全セル維持放電段階では、アドレス電極３側にお
けるイオンはそのままとされ、Ｘ電極７とＹ電極８側間
の維持放電によって、電荷の反転が生じる。さらに、図
１０(c) に示されるように、全セル消去段階では、アド
レス電極３側におけるイオンはそのままとされ、Ｘ電極
７とＹ電極８側間の消去放電によって、電圧Ｖｓからな
る維持放電パルスが印加されても、維持放電が起こらな
い値まで、壁電荷が減少する。そして、図１０(d) に示
されるように、選択書き込み段階では、線順次による選
択書き込み放電（アドレス放電）が行われる。この時、
電極からの印加電圧は、アドレス電極３にかかるアドレ
スパルスの電圧Ｖａのみであるが、全セル消去段階まで
に生成された壁電荷による電圧、つまり、アドレス電極
３側のイオンとＹ電極８側の電子による電圧がアドレス
電圧Ｖａに積み重なって作用するため、低いアドレス電
圧Ｖａで、安定に確実に選択書き込み放電（アドレス放
電）が行えることになる。First, as shown in FIG. 10A, in the all-cell writing stage, ions are accumulated on the address electrode 3 side and ions and electrons are accumulated on the X electrode 7 and Y electrode 8 side as wall charges, respectively. Next, as shown in FIG. 10B, in the all-cell sustain discharge stage, the ions on the address electrode 3 side are left as they are, and the charge is inverted by the sustain discharge between the X electrode 7 and the Y electrode 8 side. Occurs. Further, as shown in FIG. 10 (c), in the all-cell erasing stage, the ions on the address electrode 3 side are left as they are, and the erasing discharge between the X electrode 7 and the Y electrode 8 causes the sustain discharge consisting of the voltage Vs. Even if the pulse is applied, the wall charge decreases to a value at which the sustain discharge does not occur. Then, as shown in FIG. 10D, in the selective write stage, a selective write discharge (address discharge) is performed in a line-sequential manner. At this time,
The voltage applied from the electrode is only the voltage Va of the address pulse applied to the address electrode 3. However, the voltage due to the wall charges generated up to the erasing step of all the cells, that is, the ions on the address electrode 3 side and the Y electrode 8 side Since the voltage caused by the electrons is accumulated on the address voltage Va and acts, the selective write discharge (address discharge) can be stably and reliably performed at a low address voltage Va.

【００１８】そこで、この『アドレス／維持放電分離型
・アドレス方式』は、スキャンライン数（表示ライン
数）が多い場合や、フルカラー表示のために多階調表示
を行う場合に利用されており、例えば、特開平４−１９
５１８８号公報に開示されている。さらに、具体的に
は、多階調表示の一例として、１６階調表示を行う場合
の駆動方法を図１１に示す。Therefore, this "address / sustain discharge separation type / address method" is used when the number of scan lines (the number of display lines) is large or when multi-gradation display is performed for full color display. For example, Japanese Patent Application Laid-Open No.
No. 5188. Further, specifically, as an example of multi-gradation display, a driving method in the case of performing 16-gradation display is shown in FIG.

【００１９】すなわち、図１１は図８のプラズマディス
プレイ装置を駆動する一例のタイムチャートを示す図で
あり、１６階調表示を行う場合の駆動方法を示すもので
ある。図１１に示す駆動方法では、１フレームが４個の
サブフレーム（サブフィールド）ＳＦ１，ＳＦ２，ＳＦ
３，ＳＦ４に区分される。そして、これらのサブフレー
ムＳＦ１，ＳＦ２，ＳＦ３，ＳＦ４においては、全面書
き込み期間Ｔｗ１，Ｔｗ２，Ｔｗ３，Ｔｗ４を含むアド
レス期間Ｔａ１，Ｔａ２，Ｔａ３，Ｔａ４は、それぞれ
同一の長さ（時間）となる。また、維持放電期間Ｔｓ
１，Ｔｓ２，Ｔｓ３，Ｔｓ４の長さ（時間）は、１：
２：４：８の比率となる。従って、点灯させるサブフレ
ームを選択するこにより、０から１５までの１６段階の
輝度の違いを表示できるようになっている。That is, FIG. 11 is a diagram showing an example of a time chart for driving the plasma display device shown in FIG. 8, and shows a driving method in the case of displaying 16 gradations. In the driving method shown in FIG. 11, one frame has four subframes (subfields) SF1, SF2, SF
3, SF4. In these sub-frames SF1, SF2, SF3, SF4, the address periods Ta1, Ta2, Ta3, Ta4 including the entire writing periods Tw1, Tw2, Tw3, Tw4 have the same length (time). Further, the sustain discharge period Ts
The length (time) of 1, Ts2, Ts3, Ts4 is 1:
The ratio is 2: 4: 8. Therefore, by selecting a sub-frame to be turned on, it is possible to display 16 levels of luminance differences from 0 to 15.

【００２０】[0020]

【発明が解決しようとする課題】上述したように、ＡＣ
型ＰＤＰでは、階調表示を行うために１画面を形成する
１フレームがそれぞれ輝度の異なる数枚のサブフレーム
（ＳＦ）によって構成されており、各サブフレームにお
ける発光輝度は、単位時間当たりの維持放電の回数によ
って決定される。理想的には維持放電の回数に対して輝
度はリニアな関係にあり、よって任意のサブフレームの
維持放電パルス数はその次に明るいサブフレームのそれ
に対し１／２の関係を持つ方法が最適であり、この方法
は『プラズマディスプレイパネルの輝度調整に関する駆
動方法』として特開平４-281459 号公報にて出願済であ
る。この発明によれば例えば１６階調表示の場合、サブ
フレームＳＦは４枚必要となり、それぞれの１Vsync 内
の維持放電パルス数は最大輝度のＳＦ（ＳＦ４）の維持
放電パルス数を８０発とすると、サブフレームＳＦ３が
４０発、ＳＦ２が２０発、ＳＦ１が１０発となる。As described above, AC
In the type PDP, one frame forming one screen for performing gray scale display is composed of several subframes (SF) having different luminances, and the light emission luminance in each subframe is maintained per unit time. It is determined by the number of discharges. Ideally, the luminance has a linear relationship with the number of sustain discharges. Therefore, it is optimal to use a method in which the number of sustain discharge pulses in an arbitrary subframe is １ ／ that of the next brighter subframe. This method has already been filed in Japanese Patent Application Laid-Open No. Hei 4-281459 as "Driving method for luminance adjustment of plasma display panel". According to the present invention, for example, in the case of 16 gradation display, four sub-frames SF are required, and the number of sustain discharge pulses in each 1Vsync is 80 when the number of sustain discharge pulses of SF (SF4) having the maximum luminance is: The subframe SF3 has 40 shots, the SF2 has 20 shots, and the SF1 has 10 shots.

【００２１】図１２は従来のプラズマディスプレイ装置
の階調制御方法における課題を説明するための図であ
り、維持パルス数と輝度との関係を示すものである。図
１２中の実線で示すように、理想的には、輝度は維持放
電の回数に対してリニアな関係にあり、この時、階調値
に対する輝度の関係もリニアとなる。しかしながら、図
１２中の破線で示すように、実際の駆動においては、維
持放電の回数に対して輝度はリニアな関係にならずに曲
線となってしまう。その結果、階調値に対する輝度もリ
ニアな関係にならず、表示品質の著しい低下を招くこと
になる。このような問題は、近年の階調数の増大の要求
に伴って、重要なものとなって来ており、例えば、６４
階調のような多階調となると、上記の表示品質の低下が
大きな問題となる。FIG. 12 is a diagram for explaining a problem in the gradation control method of the conventional plasma display device, and shows the relationship between the number of sustain pulses and luminance. As shown by the solid line in FIG. 12, ideally, the luminance has a linear relationship with the number of sustain discharges. At this time, the relationship between the gradation value and the luminance also becomes linear. However, as shown by the broken line in FIG. 12, in actual driving, the luminance does not have a linear relationship with the number of sustain discharges but becomes a curve. As a result, the luminance with respect to the gradation value does not have a linear relationship, and the display quality is significantly reduced. Such a problem has become important with the recent demand for an increase in the number of gradations.
When the number of gradations is large, such as gradations, the above-mentioned deterioration in display quality becomes a serious problem.

【００２２】本発明は、上述した従来のプラズマディス
プレイ装置の階調制御方法が有する課題に鑑み、階調値
に対する輝度をリニアな関係としてプラズマディスプレ
イ装置の表示品質を向上させることを目的とする。The present invention has been made in view of the above-mentioned problems of the conventional gradation control method for a plasma display device, and has as its object to improve the display quality of a plasma display device by setting the luminance with respect to the gradation value to a linear relationship.

【００２３】[0023]

【課題を解決するための手段】本発明によれば、１画面
を形成する１フレームをそれぞれ輝度の異なる複数のサ
ブフレームによって構成し、該各サブフレームにおける
維持発光の回数を当該各サブフレーム毎に個別に設定
し、所定の輝度を有する階調表示を行うようにしたこと
を特徴とするプラズマディスプレイ装置の階調制御方法
が提供される。According to the present invention, one frame forming one screen is composed of a plurality of sub-frames each having a different luminance, and the number of sustain emission in each sub-frame is determined for each sub-frame. , And a gradation control method for a plasma display device, wherein gradation display having a predetermined luminance is performed.

【００２４】[0024]

【作用】本発明のプラズマディスプレイ装置の階調制御
方法によれば、各サブフレームにおける維持発光の回数
は、該各サブフレーム毎に個別に設定される。これによ
り、階調値に対する輝度をリニアな関係としてプラズマ
ディスプレイ装置の表示品質を向上させることができ
る。According to the gradation control method of the plasma display device of the present invention, the number of times of the sustain emission in each sub-frame is individually set for each sub-frame. Thus, the display quality of the plasma display device can be improved by setting the luminance with respect to the gradation value to a linear relationship.

【００２５】[0025]

【実施例】以下、図面を参照して本発明に係るプラズマ
ディスプレイ装置の階調制御方法の実施例を説明する。
図１は本発明に係るプラズマディスプレイ装置の階調制
御方法の一実施例を説明するための図である。同図にお
いて、縦軸は輝度Ｂ〔cd／m2〕を示し、また、横軸は階
調値を示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gradation control method for a plasma display device according to the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram for explaining an embodiment of a gradation control method for a plasma display device according to the present invention. In the figure, the vertical axis indicates luminance B [cd / m 2 ], and the horizontal axis indicates gradation values.

【００２６】以下の各実施例において、階調値０は全て
のサブフレーム（サブフィールド）ＳＦ１〜ＳＦ３の維
持発行を行わない場合に対応し、階調値１，２および４
は１つのサブフレームＳＦ１，ＳＦ２およびＳＦ３だけ
の維持発行を行った場合に対応し、階調値３，５および
６は２つのサブフレームＳＦ１とＳＦ２，ＳＦ１とＳＦ
３およびＳＦ２とＳＦ３の維持発行を行った場合に対応
し、そして、階調値７は全てのサブフレームＳＦ１〜Ｓ
Ｆ３の維持発行を行った場合に対応する。In each of the following embodiments, the gradation value 0 corresponds to the case where all subframes (subfields) SF1 to SF3 are not maintained and issued.
Corresponds to a case in which only one sub-frame SF1, SF2 and SF3 are maintained and issued, and the gradation values 3, 5 and 6 are two sub-frames SF1 and SF2, SF1 and SF
3 and the case where SF2 and SF3 are maintained and issued, and the gradation value 7 is set for all the sub-frames SF1 to SF
This corresponds to the case where F3 is maintained and issued.

【００２７】[0027]

【数１】 (Equation 1)

【００２８】まず、維持放電パルス数Ｐに対するパネル
の輝度Ｂの実測を行い、前述した図１２に示す階調−輝
度特性での実測値を求めその曲線を (1)式のＢ＝ｆ
1(Ｐ）とする。従来技術では、任意のサブフレームのパ
ルス数に対して、その次に大きい輝度を有するサブフレ
ームのパルス数が２倍となるように、各サブフレームの
維持発光の回数を設定していたが、本実施例では任意の
サブフレームの輝度に対して、その次に大きい輝度を有
するサブフレームの輝度が２倍となるように、各サブフ
レームの維持発光の回数を設定する。First, the brightness B of the panel is actually measured with respect to the number of sustain discharge pulses P, and the measured value of the gradation-luminance characteristic shown in FIG. 12 is obtained.
1 (P). In the related art, the number of sustained light emission in each subframe is set such that the number of pulses in the subframe having the next higher luminance is twice as large as the number of pulses in an arbitrary subframe. In this embodiment, the number of times of sustained light emission in each subframe is set such that the luminance of a subframe having the next higher luminance is twice as high as the luminance of an arbitrary subframe.

【００２９】図１２に示す階調−輝度特性での実測値を
例として、本実施例による最適化を行った場合を示す。
サブフレームＳＦ３の輝度を６０cd／ｍ2 とした時、サ
ブフレームＳＦ２の輝度は６０の半分の３０cd／ｍ2 、
サブフレームＳＦ１の輝度は３０の半分の１５cd／ｍ2
となり、このときの各階調値に対する維持放電パルス数
は次の表１の通りとなる。FIG. 12 shows an example in which the optimization according to the present embodiment is performed by taking an actual measurement value of the gradation-luminance characteristic shown in FIG.
When the luminance of the sub-frame SF3 and 60 cd / m 2, the luminance of the sub-frame SF2 is half of 60 30cd / m 2,
The luminance of the sub-frame SF1 is 15 cd / m 2 which is half of 30.
The number of sustain discharge pulses for each gradation value at this time is as shown in Table 1 below.

【００３０】[0030]

【表１】 [Table 1]

【００３１】図１において、点線が上述した最適化を行
う前、実線が最適化を行った後の関係を示すものであ
る。ここで、図１に示す実施例では、複雑な計算が不要
であるという長所があるが、維持放電パルス数Ｐに対す
るパネルの輝度Ｂの直線性が低い場合には、高階調値で
の直線性に欠けることになる。すなわち、従来のプラズ
マディスプレイ装置の階調制御方法では、各サブフレー
ムにおける維持発光の回数が等比数列的になっている
（１，２，４，８，…）のに対して、本発明のプラズマ
ディスプレイ装置の階調制御方法では、各サブフレーム
における輝度を基準にして該各サブフレームの維持発光
の回数を規定するようになっている。したがって、本発
明のプラズマディスプレイ装置の階調制御方法では、各
サブフレームにおける維持発光の回数が非等比数列的に
なる。In FIG. 1, the dotted line shows the relationship before performing the above-mentioned optimization, and the solid line shows the relationship after performing the optimization. Here, the embodiment shown in FIG. 1 has an advantage that a complicated calculation is unnecessary, but when the linearity of the panel brightness B with respect to the sustain discharge pulse number P is low, the linearity at a high gradation value is low. Will lack. That is, in the gradation control method of the conventional plasma display device, the number of times of the sustain light emission in each sub-frame is in a geometric progression (1, 2, 4, 8,...). In the gradation control method of the plasma display device, the number of sustained light emission in each sub-frame is defined based on the luminance in each sub-frame. Therefore, in the gradation control method of the plasma display device according to the present invention, the number of times of the sustain light emission in each subframe becomes an inequality geometric sequence.

【００３２】図２は本発明に係るプラズマディスプレイ
装置の階調制御方法の他の実施例を説明するための図で
あり、図３は本発明に係るプラズマディスプレイ装置の
階調制御方法のさらに他の実施例を説明するための図で
ある。図２および図３において、縦軸は輝度Ｂ〔cd／
m2〕を示し、横軸は階調値を示している。図２に示され
るように、本実施例では、階調値Ｋに対する輝度Ｂの目
標ラインを (2)式のＢ＝ｆ2(Ｋ）と設定する。ここで、
ある維持パルス数比で或る階調値Ｘにおける計算輝度値
と目標輝度との差をｂX として、例えば、８階調におけ
る各サブフレームの維持パルス数（Ｐ１、Ｐ２、Ｐ３）
は次の手順で求めることができる。FIG. 2 is a diagram for explaining another embodiment of the gradation control method of the plasma display device according to the present invention, and FIG. 3 is a diagram showing still another gradation control method of the plasma display device according to the present invention. It is a figure for explaining the Example of. 2 and 3, the vertical axis represents the luminance B [cd /
m 2 ], and the horizontal axis indicates the gradation value. As shown in FIG. 2, in the present embodiment, the target line of the luminance B with respect to the gradation value K is set as B = f 2 (K) in the equation (2). here,
The difference between the calculated brightness value and the target brightness in a certain tone value X in a certain sustain pulse number ratio as b X, for example, number of sustain pulses of each subframe in the 8 gradation (P1, P2, P3)
Can be obtained by the following procedure.

【００３３】まず、 (1)式を実測により求め,(2)式を設
定した時に (4)式から(11)式の条件を満たす(12)式のｂ
S1が最小となる時のＰ1,Ｐ2,Ｐ３が求める最適維持パル
ス数となる。すなわち、維持発光の回数に対する輝度の
実測データに基づいて、階調値に対する輝度の関係がリ
ニアな関係となるように、各階調値における理想値との
誤差の二乗の総和が最小となる場合の各サブフレームの
維持発光の回数を算出する。この図２に示す実施例は、
図１に示す実施例に比べて計算は複雑なものとなるが、
限り無く直線に近い結果を求めることができる。First, equation (1) is obtained by actual measurement, and when equation (2) is set, b of equation (12) satisfying the conditions of equations (4) through (11)
P1, P2, and P3 when S1 is the minimum are the optimum number of sustain pulses to be obtained. That is, based on the measured data of the luminance with respect to the number of times of the sustained light emission, the sum of the squares of the error from the ideal value in each gradation value is minimized so that the relation of the luminance with respect to the gradation value becomes a linear relation. The number of sustained light emission in each subframe is calculated. The embodiment shown in FIG.
Although the calculation is more complicated than the embodiment shown in FIG.
Infinitely close results can be obtained.

【００３４】また、(12)式では、各階調値における理想
値との誤差の二乗の総和が最小となる場合の各サブフレ
ームの維持発光の回数を算出したが、(12)式の代わりに
(13)式を用いれば、各階調値における理想値との誤差の
絶対値の総和が最小となる場合の各サブフレームの維持
発光の回数を算出することができる。すなわち、維持発
光の回数に対する輝度の実測データに基づいて、階調値
に対する輝度の関係がリニアな関係となるように、各階
調値における理想値との誤差の絶対値の総和が最小とな
る場合の各サブフレームの維持発光の回数を算出する。In equation (12), the number of sustained light emission in each sub-frame when the sum of the squares of the error from the ideal value in each gradation value is minimum is calculated, but instead of equation (12),
By using the expression (13), it is possible to calculate the number of times of sustained light emission in each subframe when the sum of absolute values of errors from the ideal value in each gradation value is minimized. That is, when the sum of the absolute values of the errors from the ideal value at each tone value is minimized so that the relationship between the tone values and the luminance value is linear based on the measured data of the brightness with respect to the number of times of the sustain emission. The number of sustained light emission of each subframe is calculated.

【００３５】ここで、(12)式または(13)式を用いた場
合、Ｂ＝ｆ1(Ｐ）によっては、任意の階調値の輝度に対
して、その次に大きい階調値の輝度が前者の輝度を上回
ってしまう事態を生じる恐れがあるので、これを防ぐた
めに(14)式の条件を付加する。この(14)式は、任意のサ
ブフレームのパルス数が、それ以下のパルス数を有する
サブフレームのパルス数の総和より、大きくなることを
示している。すなわち、任意の階調値を有する第１のサ
ブフレームの輝度に対して、第１のサブフレームの次に
大きい階調値を有する第２のサブフレームの輝度が該第
１のサブフレームの輝度を上回らないようにすることが
できる。Here, when the expression (12) or the expression (13) is used, depending on B = f 1 (P), the luminance of the next larger gradation value is higher than the luminance of the arbitrary gradation value. However, there is a possibility that the luminance may exceed the former luminance. To prevent this, the condition of Expression (14) is added. Equation (14) indicates that the number of pulses in an arbitrary subframe is larger than the sum of the number of pulses in a subframe having a smaller number of pulses. That is, with respect to the luminance of the first sub-frame having an arbitrary gradation value, the luminance of the second sub-frame having the second largest gradation value after the first sub-frame is the luminance of the first sub-frame. Can not be exceeded.

【００３６】さらに、高い輝度を得たい場合は各サブフ
レームの維持パルス数を多くすればよいが、一垂直同期
期間内での限られた時間内に入る維持パルス数は限られ
ているため、まず、一垂直同期信号内でのパルス数の総
和（Ｐ１＋Ｐ２＋Ｐ３）、または、最上位サブフレーム
のパルス数（Ｐ３）を設定したのち、(4) 式から(11)式
の条件を満たす(12)式のｂS1、または、(13)式のｂS2が
最小となる時のＰ1,Ｐ2,Ｐ３を求めれば、それが最適維
持パルス数となる。このとき、 (2)式のＢ＝ｆ 2(Ｋ）の
設定は必要ない。なお、図２の実施例では、ＳＦ３のパ
ルス数は６０に設定されている。すなわち、複数のサブ
フレームにおける１つ若しくは２つのサブフレームの維
持発行の回数の和、または、２つ若しくは３つのサブフ
レームの維持発行の回数の和を指定するように構成して
もよい。Further, when it is desired to obtain high brightness,
It is sufficient to increase the number of sustain pulses in the frame.
The number of sustain pulses within a limited time period is limited
First, the total number of pulses in one vertical sync signal
Sum (P1 + P2 + P3) or top subframe
After setting the number of pulses (P3), the equations (4) to (11)
BS1 in equation (12) or bS2 in equation (13) that satisfies the condition
If P1, P2, and P3 at the minimum are found, they are optimally maintained.
It becomes the number of holding pulses. At this time, B = f in equation (2) Two(K)
No configuration is required. In the embodiment shown in FIG.
The number of looses is set to 60. That is, multiple sub
The retention of one or two subframes in a frame
Sum of the number of issues issued, or 2 or 3 sub-offices
It is configured to specify the sum of the number of frames
Is also good.

【００３７】次に、図３に示すように、十分長い一垂直
同期期間が有り、且つ、目標とする最高輝度の設定が必
要な場合、まず、最高輝度ｆ1(Ｐ１＋Ｐ２＋Ｐ３）を設
定した後、 (3)式から(10)式の条件を満たす(12)式のｂ
S1、または、(13)式のｂS2が最小となる時のＰ1,Ｐ2,Ｐ
３を求めれば、それが最適維持パルス数となる。このと
き、 (2)式のＢ＝ｆ2(Ｋ）の設定は必要ない。なお、図
３の実施例では、階調値７の輝度は１４０cd／ｍ2 と設
定されている。すなわち、複数のサブフレームにおい
て、最大階調値のサブフレームの輝度を指定するように
構成してもよい。Next, as shown in FIG. 3, when there is a sufficiently long one vertical synchronization period and it is necessary to set a target maximum luminance, first, the maximum luminance f 1 (P1 + P2 + P3) is set. Equation (12) that satisfies the conditions of Equation (10) from Equation (3)
P1, P2, P when S1 or bS2 in equation (13) is minimum
If 3 is obtained, it becomes the optimal number of sustain pulses. At this time, it is not necessary to set B = f 2 (K) in equation (2). In the embodiment of FIG. 3, the luminance of the gradation value 7 is set to 140 cd / m 2 . That is, in a plurality of subframes, the luminance of the subframe having the maximum gradation value may be specified.

【００３８】以上の各方法により求めた最適維持放電パ
ルス数を用いて、次に示す駆動を行う。図４および図５
は本発明のプラズマディスプレイ装置の階調制御方法が
適用されるプラズマディスプレイ装置の一実施例を示す
ブロック図である。図４および図５（図５）において、
参照符号１０は制御回路、１１は表示データ制御部、１
２はフレームメモリ、１３はパネル駆動制御部、１４は
スキャンドライバ制御部、そして、１５は共通ドライバ
制御部である。さらに、参照符号２１はアドレスドライ
バ、２２はＸドライバ、２３はＹスキャンドライバ、２
４はＹドライバ、そして、３０はプラズマ・ディスプレ
イ・パネル（ＰＤＰ）である。これらの構成は、前述し
た図８に示すものと同様であるので、その説明は省略す
る。The following driving is performed using the optimum number of sustain discharge pulses obtained by each of the above methods. 4 and 5
1 is a block diagram showing one embodiment of a plasma display device to which a gradation control method for a plasma display device according to the present invention is applied. 4 and 5 (FIG. 5),
Reference numeral 10 denotes a control circuit, 11 denotes a display data control unit, 1
2 is a frame memory, 13 is a panel drive control unit, 14 is a scan driver control unit, and 15 is a common driver control unit. Further, reference numeral 21 is an address driver, 22 is an X driver, 23 is a Y scan driver, 2
4 is a Y driver, and 30 is a plasma display panel (PDP). Since these configurations are the same as those shown in FIG. 8 described above, the description thereof will be omitted.

【００３９】図４および図５（図４）において、参照符
号４１は駆動用高圧入力、４２は消費電流検出回路、４
３はＡ／Ｄ変換器、そして、４４は自動消費電力制御部
（APC: Automatic Power Controller)を示している。さ
らに、参照符号５１は輝度調整ボリューム、５２はＡ／
Ｄ変換器、５３は維持パルス数パターン選択信号外部入
力部、５４は維持パルス数パターン選択用加算器、５５
はＲＯＭ（読み出し専用メモリ）、そして、５６はＳＦ
毎維持パルス数外部入力部を示している。また、参照符
号ＳＷ１およびＳＷ２は選択スイッチを示している。4 and 5 (FIG. 4), reference numeral 41 denotes a high voltage input for driving, 42 denotes a current consumption detecting circuit,
Reference numeral 3 denotes an A / D converter, and reference numeral 44 denotes an automatic power controller (APC). Further, reference numeral 51 denotes a brightness adjustment volume, and 52 denotes A /
D converter, 53 is a sustain pulse number pattern selection signal external input unit, 54 is a sustain pulse number pattern selection adder, 55
Is ROM (read only memory), and 56 is SF
3 shows an external input unit for each sustain pulse number. Reference numerals SW1 and SW2 indicate selection switches.

【００４０】上述したプラズマディスプレイ装置の階調
制御方法（最適維持発光回数算出方法）により算出され
た維持放電パルス数データは、ＲＯＭ５５に格納されて
いる。このＲＯＭ５５から出力される維持放電パルス数
データは、制御回路１０内の共通ドライバ制御部１５に
供給される。ここで、各サブフレーム毎の維持放電パル
スの制御信号をＲＯＭ５５から受けた指定数だけ、規定
タイミングでＸドライバ２２およびＹドライバ２４へ向
けて出力する。Ｘドライバ２２およびＹドライバ２４で
は、制御回路１０から供給された制御信号に基づいてパ
ネル駆動用高圧パルスを出力する。すなわち、各サブフ
レームにおける維持発光の回数をＲＯＭ５５に設定し、
該ＲＯＭ５５から各サブフレームの維持発光の回数情報
を随時読み出すようになっている。The data of the number of sustain discharge pulses calculated by the above-described gradation control method (the method of calculating the number of optimal sustain light emission times) of the plasma display device is stored in the ROM 55. The sustain discharge pulse number data output from the ROM 55 is supplied to the common driver control unit 15 in the control circuit 10. Here, the control signal of the sustain discharge pulse for each subframe is output to the X driver 22 and the Y driver 24 at specified timing by the specified number received from the ROM 55. The X driver 22 and the Y driver 24 output a panel driving high voltage pulse based on the control signal supplied from the control circuit 10. That is, the number of times of sustain emission in each subframe is set in the ROM 55,
Information on the number of times of sustained light emission of each sub-frame is read from the ROM 55 as needed.

【００４１】ここで、新規にＲＯＭを追加せずに、駆動
波形用として従来から使用していたＲＯＭの空き領域を
有効活用すればコストダウン及び実装面積の節約につな
がる。すなわち、各サブフレームにおける維持発光の回
数を設定して記憶する記憶装置を、プラズマディスプレ
イ装置における駆動波形用記憶素子５５の空き領域によ
り構成することができる。Here, if a free area of the ROM conventionally used for driving waveforms is effectively utilized without adding a new ROM, cost and mounting area can be reduced. That is, a storage device that sets and stores the number of times of sustained light emission in each subframe can be configured by an empty area of the drive waveform storage element 55 in the plasma display device.

【００４２】さらに、ＲＯＭ内の維持放電パルス数デー
タを一通りのみでなく、(12)式および(13)式を用いて相
対輝度の異なる複数通りのパターンのデータを算出して
設定すれば、一定の階調表示を保ちつつ輝度調整が可能
となる。輝度調整ヴォリューム５１により設定された輝
度情報は、Ａ／Ｄ変換５２によりディジタル信号に変換
されＲＯＭアドレス信号となり、維持発光回数データの
選択を行う。すなわち、輝度調整用ボリューム５１によ
りＲＯＭに設定された各サブフレームの維持発光の回数
情報の内の１通りを選択するように構成することができ
る。これにより、ユーザーによる装置の使用環境に応じ
た輝度設定が可能となる。Further, if not only the data of the number of sustain discharge pulses in the ROM but also the data of a plurality of patterns having different relative luminances are calculated and set using the equations (12) and (13), Brightness can be adjusted while maintaining a constant gradation display. The luminance information set by the luminance adjustment volume 51 is converted into a digital signal by the A / D converter 52 to become a ROM address signal, and the number of sustained light emission data is selected. That is, the brightness adjustment volume 51 can be configured to select one of the information on the number of times of sustained light emission of each sub-frame set in the ROM. This allows the user to set the luminance according to the usage environment of the device.

【００４３】この時、選択スイッチＳＷ１を接点(1) 側
から接点(2) 側へ切り替えることによって、輝度調整ヴ
ォリューム５１による情報の代わりに維持パルス数パタ
ーン選択情報外部入力部５３を介して情報を装置外部か
ら入力させることができる。また、サブフレームの維持
発光の回数情報を複数の組み合わせとしてＲＯＭ５５に
設定し、該複数の組み合わせの任意の１つをプラズマデ
ィスプレイ装置の外部から供給する選択信号により選択
するように構成してもよい。これにより、輝度調整の遠
隔操作等が可能となる。At this time, by switching the selection switch SW1 from the contact (1) side to the contact (2) side, information is output via the sustain pulse number pattern selection information external input unit 53 instead of the information by the brightness adjustment volume 51. It can be input from outside the device. Further, the information on the number of times of sustained light emission of the sub-frame may be set as a plurality of combinations in the ROM 55, and any one of the plurality of combinations may be selected by a selection signal supplied from outside the plasma display device. . This enables remote control of brightness adjustment and the like.

【００４４】さらに、本プラズマディスプレイ装置で
は、発光輝度および表示率により消費電流が大きく異な
るため、公知の技術を使用して、電源経路に消費電流検
出回路４２を設け、表示率の増加等により消費電流が規
定値を上回るような場合、輝度を抑える事により消費電
流を抑えて設定値以下に制御するようになっている。こ
の消費電力を制御するための自動消費電力制御部（消費
電流制御手段）４４の出力を維持パルス数パターン選択
用加算器で加算してＲＯＭ５５に書き込むことにより、
消費電流を一定値以下に抑えつつ滑らかな階調制御を行
うことが可能となる。すなわち、表示率の変化に係わら
ず消費電力を一定とすることができる。Furthermore, in the present plasma display device, the current consumption greatly varies depending on the light emission luminance and the display rate. Therefore, a known current technique is used to provide a current consumption detection circuit 42 in the power supply path to increase the display rate and the like. When the current exceeds a specified value, the current consumption is suppressed by suppressing the luminance, and the current is controlled to be equal to or less than the set value. The output of the automatic power consumption control unit (current consumption control means) 44 for controlling the power consumption is added by the adder for selecting the number of sustain pulses and written into the ROM 55,
Smooth gradation control can be performed while suppressing current consumption to a certain value or less. That is, the power consumption can be kept constant irrespective of the change in the display ratio.

【００４５】上述したプラズマディスプレイ装置の構成
では、プラズマディスプレイ装置の本体内部にＲＯＭ
（５５）を設け、その情報を元に各制御を行うようにな
っている。ところで、一般に、プラズマディスプレイ装
置の寿命は輝度半減で定義される場合が多く、例えば、
このような現象に対応すべくユニット外部から、より高
度な階調制御を行いたい場合には、選択スイッチＳＷ２
を接点(1) 側 から接点(2) 側へ切り替えることによ
り、サブフレーム（サブフィールド）ＳＦ毎の維持パル
ス数の外部入力が可能となり、その結果、維持放電パル
ス数の変更をリアルタイムで行うことも可能となる。In the above-described configuration of the plasma display device, the ROM is installed inside the main body of the plasma display device.
(55) is provided, and each control is performed based on the information. By the way, in general, the lifetime of a plasma display device is often defined by luminance halving, for example,
To perform more advanced gradation control from outside the unit to cope with such a phenomenon, the selection switch SW2
By switching from the contact (1) side to the contact (2) side, external input of the number of sustain pulses for each subframe (subfield) SF becomes possible, and as a result, the number of sustain discharge pulses can be changed in real time. Is also possible.

【００４６】以上の実施例の説明においては、３電極構
造を有する面放電交流駆動型のプラズマディスプレイ装
置を本発明のプラズマディスプレイ装置の階調制御方法
が適用される一例として詳述したが、本発明は、この３
電極面放電交流駆動型プラズマディスプレイ装置の他に
も、例えば、２電極構造を有する対向放電型のプラズマ
ディスプレイ装置等の他の様々なプラズマディスプレイ
装置に対しても適用することができるのはいうまでもな
い。In the above description of the embodiment, the surface discharge AC drive type plasma display device having a three-electrode structure has been described in detail as an example to which the gradation control method of the plasma display device of the present invention is applied. The invention is this 3
It goes without saying that the present invention can be applied to various other plasma display devices such as a counter discharge type plasma display device having a two-electrode structure, in addition to the electrode surface discharge AC drive type plasma display device. Nor.

【００４７】[0047]

【発明の効果】以上、詳述したように、本発明のプラズ
マディスプレイ装置の階調制御方法によれば、各サブフ
レームにおける維持発光の回数は、該各サブフレーム毎
に個別に設定される。これにより、階調値に対する輝度
をリニアな関係としてプラズマディスプレイ装置の表示
品質を向上させることができる。As described above, according to the gradation control method for a plasma display device of the present invention, the number of times of sustain emission in each sub-frame is individually set for each sub-frame. Thus, the display quality of the plasma display device can be improved by setting the luminance with respect to the gradation value to a linear relationship.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係るプラズマディスプレイ装置の階調
制御方法の一実施例を説明するための図である。FIG. 1 is a diagram for explaining an embodiment of a gradation control method for a plasma display device according to the present invention.

【図２】本発明に係るプラズマディスプレイ装置の階調
制御方法の他の実施例を説明するための図である。FIG. 2 is a diagram for explaining another embodiment of the gradation control method of the plasma display device according to the present invention.

【図３】本発明に係るプラズマディスプレイ装置の階調
制御方法のさらに他の実施例を説明するための図であ
る。FIG. 3 is a diagram for explaining still another embodiment of the gradation control method of the plasma display device according to the present invention.

【図４】本発明のプラズマディスプレイ装置の階調制御
方法が適用されるプラズマディスプレイ装置の一実施例
を示すブロック図（その１）である。FIG. 4 is a block diagram (part 1) showing one embodiment of a plasma display device to which the gradation control method of the plasma display device of the present invention is applied.

【図５】本発明のプラズマディスプレイ装置の階調制御
方法が適用されるプラズマディスプレイ装置の一実施例
を示すブロック図（その２）である。FIG. 5 is a block diagram (part 2) showing one embodiment of a plasma display device to which the gradation control method of the plasma display device of the present invention is applied.

【図６】従来の３電極面放電交流駆動型のプラズマディ
スプレイパネルの概略的構造を示す平面図である。FIG. 6 is a plan view showing a schematic structure of a conventional three-electrode surface discharge AC drive type plasma display panel.

【図７】図６のプラズマディスプレイパネルにおける１
つの放電セルの概略的構造を示す断面図である。FIG. 7 shows the plasma display panel 1 of FIG.
FIG. 3 is a cross-sectional view showing a schematic structure of one discharge cell.

【図８】図６に示すプラズマディスプレイパネルを用い
た３電極面放電交流駆動型プラズマディスプレイ装置の
一例を示すブロック図である。8 is a block diagram showing an example of a three-electrode surface discharge AC drive type plasma display device using the plasma display panel shown in FIG.

【図９】図８のプラズマディスプレイ装置における駆動
波形の一例を示す図である。9 is a diagram showing an example of a driving waveform in the plasma display device of FIG.

【図１０】図８のプラズマディスプレイ装置において駆
動されるセルの様子を模式的に示す図である。10 is a diagram schematically showing a state of a cell driven in the plasma display device of FIG.

【図１１】図８のプラズマディスプレイ装置を駆動する
一例のタイムチャートを示す図である。11 is a diagram showing a time chart of an example of driving the plasma display device of FIG. 8;

【図１２】従来のプラズマディスプレイ装置の階調制御
方法における課題を説明するための図である。FIG. 12 is a diagram for explaining a problem in a gradation control method of a conventional plasma display device.

【符号の説明】[Explanation of symbols]

１…前面ガラス基板 ２…背面ガラス基板 ３…アドレス電極 ４…壁 ５…蛍光体 ６…誘電体層 ７…Ｘ電極（維持電極） ８…Ｙ電極（維持電極） １０…制御回路 １１…表示データ制御部 １２…フレームメモリ １３…パネル駆動制御部 １４…スキャンドライバ制御部 １５…共通ドライバ制御部 ２１…アドレスドライバ ２２…Ｘドライバ ２３…Ｙスキャンドライバ ２４…Ｙドライバ ３０…プラズマ・ディスプレイ・パネル（ＰＤＰ） ４１…駆動用高圧入力 ４２…消費電流検出回路 ４３…Ａ／Ｄ変換器 ４４…自動消費電力制御部 ５１…輝度調整ボリューム ５２…Ａ／Ｄ変換器 ５３…維持パルス数パターン選択信号外部入力部 ５４…維持パルス数パターン選択用加算器 ５５…ＲＯＭ ５６…ＳＦ毎維持パルス数外部入力部 ＳＷ１，ＳＷ２…選択スイッチ REFERENCE SIGNS LIST 1 front glass substrate 2 rear glass substrate 3 address electrode 4 wall 5 phosphor 6 dielectric layer 7 X electrode (sustain electrode) 8 Y electrode (sustain electrode) 10 control circuit 11 display data Control unit 12 ... Frame memory 13 ... Panel drive control unit 14 ... Scan driver control unit 15 ... Common driver control unit 21 ... Address driver 22 ... X driver 23 ... Y scan driver 24 ... Y driver 30 ... Plasma display panel (PDP) 41: High voltage input for driving 42: Current consumption detection circuit 43: A / D converter 44: Automatic power consumption control unit 51: Brightness adjustment volume 52: A / D converter 53: External pulse input unit for selecting the number of sustain pulse patterns 54: Sustain pulse number pattern selecting adder 55: ROM 56: Sustain pulse number per SF external input section SW1, SW2 Selection switch

───────────────────────────────────────────────────── フロントページの続き (72)発明者 金澤 義一 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (72)発明者 上田 壽男 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (56)参考文献 特開 平１−237695（ＪＰ，Ａ) 特開 平１−163795（ＪＰ，Ａ) 特開 平３−102985（ＪＰ，Ａ) 特開 昭60−101594（ＪＰ，Ａ) 特開 平５−11725（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G09G 3/00 - 3/38──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshikazu Kanazawa 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Toshio Ueda 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited ( 56) References JP-A 1-237695 (JP, A) JP-A 1-163795 (JP, A) JP-A-3-102985 (JP, A) JP-A-60-101594 (JP, A) JP Hei 5-11725 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G09G 3/00-3/38

Claims (15)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 １画面を形成する１フレームをそれぞれ
輝度の異なる複数のサブフレームによって構成し、該各
サブフレームにおける維持発光の回数を当該各サブフレ
ーム毎に個別に設定し、所定の輝度を有する階調表示を
行うようにしたことを特徴とするプラズマディスプレイ
装置の階調制御方法。1. A frame forming one screen is constituted by a plurality of sub-frames having different luminances, and the number of sustain emission in each sub-frame is individually set for each sub-frame, and a predetermined luminance is set. A gradation control method for a plasma display device, characterized in that a gradation display is performed. 【請求項２】 前記プラズマディスプレイ装置の階調制
御方法は、維持発光の回数に対する輝度の実測データに
基づいて、任意の輝度を有する第１のサブフレームによ
り得られる輝度が、該第１のサブフレームの次の輝度を
有する第２のサブフレームにより得られる輝度の２倍と
なるようにして、前記各サブフレームの維持発光の回数
を算出するようにしたことを特徴とする請求項１のプラ
ズマディスプレイ装置の階調制御方法。2. The method of controlling gradation of a plasma display device according to claim 1, wherein the luminance obtained by a first sub-frame having an arbitrary luminance is determined based on measured luminance data with respect to the number of times of sustained light emission. 2. The plasma according to claim 1, wherein the number of times of sustain emission in each of the sub-frames is calculated so as to be twice as high as the luminance obtained by a second sub-frame having the next luminance of the frame. A gradation control method for a display device. 【請求項３】 前記各サブフレームにおける維持発光の
回数を、非等比数列的に設定するようにしたことを特徴
とする請求項１のプラズマディスプレイ装置の階調制御
方法。3. The gradation control method for a plasma display device according to claim 1, wherein the number of times of sustained light emission in each of the sub-frames is set in an inequality geometric sequence. 【請求項４】 前記プラズマディスプレイ装置の階調制
御方法は、維持発光の回数に対する輝度の実測データに
基づいて、階調値に対する輝度の関係がリニアな関係と
なるように、該各階調値における理想値との誤差の二乗
の総和が最小となる場合の前記各サブフレームの維持発
光の回数を算出するようにしたことを特徴とする請求項
１のプラズマディスプレイ装置の階調制御方法。4. The gradation control method for a plasma display device according to claim 1, wherein the relationship between the brightness and the gradation value is linear based on measured data of the brightness with respect to the number of times of sustained light emission. 2. The gradation control method for a plasma display device according to claim 1, wherein the number of times of sustained light emission in each of said sub-frames when the sum of squares of an error from an ideal value is minimized is calculated. 【請求項５】 前記プラズマディスプレイ装置の階調制
御方法は、維持発光の回数に対する輝度の実測データに
基づいて、階調値に対する輝度の関係がリニアな関係と
なるように、該各階調値における理想値との誤差の絶対
値の総和が最小となる場合の前記各サブフレームの維持
発光の回数を算出するようにしたことを特徴とする請求
項１のプラズマディスプレイ装置の階調制御方法。5. The gradation control method for a plasma display device according to claim 1, wherein the relationship between the gradation value and the luminance is linear based on measured data of the luminance with respect to the number of times of sustained light emission. 2. The gradation control method for a plasma display device according to claim 1, wherein the number of times of sustained light emission in each of the sub-frames when the sum of absolute values of errors from an ideal value is minimized is calculated. 【請求項６】 前記任意の階調値を有する第１のサブフ
レームの輝度に対して、該第１のサブフレームの次に大
きい階調値を有する第２のサブフレームの輝度が該第１
のサブフレームの輝度を上回らないようにしたことを特
徴とする請求項４または５のプラズマディスプレイ装置
の階調制御方法。6. The luminance of a second sub-frame having the next largest gradation value after the first sub-frame is higher than the luminance of the first sub-frame having the arbitrary gradation value.
6. The gradation control method for a plasma display device according to claim 4, wherein the luminance of the sub-frame is not exceeded. 【請求項７】 前記複数のサブフレームにおける１つ若
しくは２つのサブフレームの維持発行の回数の和、また
は、２つ若しくは３つのサブフレームの維持発行の回数
の和を指定するようにしたことを特徴とする請求項４ま
たは５のプラズマディスプレイ装置の階調制御方法。7. The method according to claim 1, wherein the sum of the number of times of maintaining and issuing one or two subframes in the plurality of subframes or the sum of the number of times of maintaining and issuing two or three subframes is specified. 6. The gradation control method for a plasma display device according to claim 4, wherein: 【請求項８】 前記複数のサブフレームにおいて、最大
階調値のサブフレームの輝度を指定するようにしたこと
を特徴とする請求項４または５のプラズマディスプレイ
装置の階調制御方法。8. A gradation control method for a plasma display device according to claim 4, wherein a luminance of a sub-frame having a maximum gradation value is designated in said plurality of sub-frames. 【請求項９】 維持放電を行う平行する維持放電電極
（７，８）と、該維持放電電極に直行して配置されたア
ドレス電極（３）とを具備し、前記維持放電電極の一方
（７）を共通接続し、且つ、他方（８）を表示ライン毎
に独立して設け、壁電荷をメモリ媒体として利用した面
放電構造を有する３電極型面放電交流型プラズマディス
プレイ装置であって、全画面における表示データの書き
込みを該表示データに応じて維持放電に必要な壁電荷を
形成することで行うアドレス期間と発光のための維持放
電を繰り返して行う維持放電期間とを分離してプラズマ
ディスプレイ装置を駆動し、１画面を形成する１フレー
ムをそれぞれ輝度の異なる複数のサブフレームによって
構成し、そして、該各サブフレームにおける維持発光の
回数を当該各サブフレーム毎に個別に設定して所定の輝
度を有する階調表示を行うようにしたことを特徴とする
プラズマディスプレイ装置。9. A sustain discharge electrode (7, 8) for performing a sustain discharge, and an address electrode (3) arranged perpendicular to the sustain discharge electrode, wherein one of the sustain discharge electrodes (7, 8) is provided. ) Are commonly connected, and the other (8) is provided independently for each display line, and has a surface discharge structure using wall charges as a memory medium. A plasma display device in which an address period in which display data is written on a screen by forming wall charges necessary for sustain discharge in accordance with the display data and a sustain discharge period in which sustain discharge for light emission is repeated is separated. , One frame forming one screen is composed of a plurality of sub-frames having different luminances, and the number of sustained light emission in each of the sub-frames is determined by each of the sub-frames. A plasma display device, wherein a gray scale display having a predetermined luminance is set by individually setting each image. 【請求項１０】 前記プラズマディスプレイ装置は、各
サブフレームにおける維持発光の回数を設定して記憶す
る記憶手段（５５）を具備し、該記憶手段から前記各サ
ブフレームの維持発光の回数情報を随時読み出すように
したことを特徴とする請求項９のプラズマディスプレイ
装置。10. The plasma display apparatus further comprises a storage means (55) for setting and storing the number of times of sustained light emission in each sub-frame, and from the storage means, the information on the number of times of sustained light emission in each of the sub-frames is stored as needed. 10. The plasma display device according to claim 9, wherein reading is performed. 【請求項１１】 前記記憶手段を、前記プラズマディス
プレイ装置における駆動波形用記憶素子（５５）の空き
領域により構成し、前記各サブフレームの維持発光の回
数情報を当該駆動波形用記憶素子の空き領域に設定する
ようにしたことを特徴とする請求項１０のプラズマディ
スプレイ装置。11. The storage means comprises an empty area of a drive waveform storage element (55) in the plasma display device, and stores information on the number of times of sustained light emission of each of the subframes in the empty area of the drive waveform storage element. 11. The plasma display device according to claim 10, wherein the setting is set to. 【請求項１２】 前記プラズマディスプレイ装置は、輝
度調整を行う輝度調整用ボリューム（５１）を具備し、
該輝度調整用ボリューム（５１）により前記記憶手段
（５５）に設定された前記各サブフレームの維持発光の
回数情報の内の１通りを選択するようにしたことを特徴
とする請求項１０のプラズマディスプレイ装置。12. The plasma display device includes a brightness adjusting volume (51) for adjusting brightness.
11. The plasma according to claim 10, wherein one of the information on the number of times of sustained light emission of each of said sub-frames set in said storage means (55) is selected by said brightness adjusting volume (51). Display device. 【請求項１３】 前記各サブフレームにおける維持発光
の回数を、複数の組み合わせとして前記記憶手段（５
５）に設定し、該複数の組み合わせの任意の１つを前記
プラズマディスプレイ装置の外部から供給する選択信号
により選択するようにしたことを特徴とする請求項１０
のプラズマディスプレイ装置。13. The storage unit (5), wherein the number of times of sustained light emission in each of the sub-frames is a plurality of combinations
11. The method according to claim 10, wherein the setting is set to 5), and any one of the plurality of combinations is selected by a selection signal supplied from outside the plasma display device.
Plasma display device. 【請求項１４】 前記プラズマディスプレイ装置は、該
プラズマディスプレイ装置の消費電流を所定値以下に制
御する消費電流制御手段（４）を具備し、前記各サブフ
レームにおける維持発光の回数を複数の組み合わせとし
て前記記憶手段（５５）に設定し、該複数の組み合わせ
の任意の１つを前記消費電流制御手段（４４）の出力に
応じて選択して、表示率の変化に係わらず消費電力を一
定とするようにしたことを特徴とする請求項１０のプラ
ズマディスプレイ装置。14. The plasma display device according to claim 1, further comprising current consumption control means for controlling a current consumption of the plasma display device to a predetermined value or less, wherein the number of times of sustained light emission in each of the sub-frames is a plurality of combinations. An arbitrary one of the plurality of combinations is set in the storage unit (55) according to the output of the current consumption control unit (44), and the power consumption is kept constant regardless of a change in the display ratio. 11. The plasma display device according to claim 10, wherein: 【請求項１５】 前記各サブフレームの維持発光の回数
情報を該プラズマディスプレイ装置の外部から供給する
ようにしたことを特徴とする請求項１０のプラズマディ
スプレイ装置。15. The plasma display device according to claim 10, wherein the information on the number of times of sustained light emission in each of the sub-frames is supplied from outside the plasma display device.
JP5288345A 1993-11-17 1993-11-17 Gradation control method for plasma display device Expired - Lifetime JP2856241B2 (en)

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JP5288345A JP2856241B2 (en) 1993-11-17 1993-11-17 Gradation control method for plasma display device
EP98203252A EP0887785B1 (en) 1993-11-17 1994-01-31 Controlling the gray scale of plasma display devices
EP94300695A EP0653740B1 (en) 1993-11-17 1994-01-31 Controlling the gray scale of plasma display devices
DE69431681T DE69431681T2 (en) 1993-11-17 1994-01-31 Grayscale control for plasma displays
DE69424122T DE69424122T2 (en) 1993-11-17 1994-01-31 Grayscale control for plasma display devices
KR1019940001769A KR970000911B1 (en) 1993-11-17 1994-01-31 The controlling method of the gray scale in a plasma display devices and the same apparatus
US08/488,201 US5943032A (en) 1993-11-17 1995-06-07 Method and apparatus for controlling the gray scale of plasma display device
US09/938,303 USRE40769E1 (en) 1993-11-17 2001-08-24 Method and apparatus for controlling the gray scale of plasma display device

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JP5288345A JP2856241B2 (en) 1993-11-17 1993-11-17 Gradation control method for plasma display device

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DE69431681D1 (en) 2002-12-12
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